Manufacturer: SPERRY REMINGTON
Model: 663
AKA:  
Year:  
Display: VCF (6)
Circuits: HITACHI: HD32170P
Dimensions: 155x85x30 mm
Power type: 6V-4xAA / Adapter
Origin: Japan
S/N: 3052586
Owner: DEVIDTS Serge
Info: Only 6 digit


Another 663-model (probably older) 
(picture courtesy unknown)^


6-digit display with funny zeros ^

Internals ^

Adapter and instructions ^
(picture courtesy unknown)

Label (bottom) ^